William a



(No Model.)

W. A. POLMAT'EER.

SEWING MAGHINE.

Nos-365 4.86. Patented'June 28, 1887.

UNITE STATES PATENT OFFICE.

WILLIAM A. POLMATEER, OF JOHNSTOWN, NEW YORK, ASSIGNOR TO WILLIAM S. NORTHRUP, OF SAME PLACE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent Nov-365,486, dated June 28, 1887.

Application filed January 524, 1857. Serial No. 225,358.

To all whom it may concern:

Beit known that l, VILLIAM A. PoLMA TEER, of Johnstown, in the county of Fulton and State of New York, have invented certain Improvements in Sewing-Machines, of which the foltowing is a specification. y

This invention relates to that class of machines in which oscillating shuttles'are employed, and particularly to improvements on the machine for which Letters Patent of the United States were granted to me on the 3d day of November, 1885, No. 329,484, wherein a series of rollers were grouped around the shuttle to engage its periphery and afford a proper guidance therefor. In the original machine I employed rollers having beveled edges to enter a V-groove in the shuttle, or with V-grooves to receive the beveled edge of the shuttle. In practice it has been found that when operating the machine at very high speeds, and with threads under heavy tension, as in the sewing of leather, the beveled bearingsurfaces are open to certain minor objections, which it is the object of the present invention to overcome. To this end I now construct the shuttle, as was done prior to my.

original invention, with flat peripheral faces and two side faces at right angles thereto, or, in other words, of rectangular cross section, and combine therewith guiding-rolls which have flat peripheral faces to bear against and support the periphery of the shuttle and flanged at the two ends to engage the side faces of the shuttle and prevent its lateral motion. This construction gives much greater area than before to the supporting and wearing 'surfacesof the rolls and the shuttle, and prealso shown in position.

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structions, and gave good results under ordinary conditions, it was found that their surfaces and the surfaces of the shuttle would in time bGOOlllQWOll] so as to produce'an increased friction between them and to permit the edge of the shuttle to play laterally to a limited extent. The present construction wholly overcomes these difficulties.

The use of the flanged rolls hereindescribed is also advantageous, in that it avoids the necessity for the shuttle clamping finger 0 shown in my former patent.

In the accompanying drawings, Figure 1 represents a side elevation of a shuttle and its race. constructed in accordance with my pres ent invention, the needle and cloth-plate being Fig. 2 is a cross-sectiouon the line a: w of Fig. 1.

Referring to the drawings, A represents the cloth-plate; B, the stationary ring or race, having a central opening, in which the oscillating shuttle O is located; and D D, the series of shuttle supporting and guiding rollers, having their pivots or journals seated in the ring B. As shown in Fig. 2, the shuttle has its outer edge of rectangular form in cross-section, while the rollers are each formed with a cylind rical body to bear against the flat outer edge of the shuttle, and with two side flanges, a, having their inner faces perpendicular to the surface of the body and adapted to' overlap the side faces of the shuttle.

Having thus described my invention, what I claim is- In a sewing-machine, the combination of NVILLIAM A. POLMATEER.

\Vitnesses:

WILLIAM S. NORTHRUP, SIDNEY-P. HoLLINoswoRTH. 

